The Revs cannot legally appraise any items.
You should email or call (1-800-272-8258) either the American Society of Appraisers, or email or call (212-889-5494) the Appraisers Association of America.
The Museum is open Tuesday, Thursday, Saturday, 10 am-4 pm. Tickets are required.
The Library is open Monday-Friday, 8 am-5 pm